Blindstitch sewing-machine.



L. ONDBRDONK.

BLINDSTITGH snwme MACHINE.

APPLICATION FILED DBO.6, 1907.

Patented Mar. 23, 1915.

'2 SHEETS-8HEET 1- L. ONDERDONK.

BLINDSTITOH SEWING MACHINE.

' APPLIOATION FILED D110. 6, 1907.

1,132,966. Patented Mar,23,1915.

2 SHEETS-SHEET 2.

' STA LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOR TO UNION SPECIALMACHINE- COMPANY, OF CHICAGO, ILLINOIS, A CORIOPAATION OF ILLINOIS.

BLINDSTITCI-I SEWING-MACHINE.

Specification of Letters Patent. Patented B131. 23,1915.

Application filed December 6, 1907. Serial No. 405,359.

compact arrangement of the stitch forming elements.

In the drawings which show by way of illustration, one embodiment of myinvention:Figure 1 is a sectional view of the overhanging arm showing myimproved arrangement of stitch forming mechanism. Fig. 2 is a frontelevation of the overhanging arm, with the face plate .rernoved. Fig. 3is a detail of the needle operating link.

Fig. 4 is a detail, showing the arrangement of the cranks for operatingthe looper and spreader.

The work support 1 is provided with a crimping ridge 2, over which thefabric is bent, so that the needle may enter and emerge on the same faceof the fabric. overhanging arm 3 has mounted therein a main shaft 4,from which the stitch forming elements receive their motion. A needle 5is carried by a needle lever 6, which is pivoted at 7 to a studprojecting from the lower end of the needle head, supported on theoverhanging arm. Said needle lever is also provided with a ball stud 8,to which is connected one end of a link 9. The main shaft 4 is providedwith an eccentric 10, which engages the other end of the link 9. It willbe noted that the eccentric which operates the needle lever is locatedin the forward end of the overhanging arm, and that the link oreccentric strap 9 extends down closely beside the needle head, so thatthe entire portion of the machine underneath the overhanging arm is freeand unobstructed. The shaft 4 is extended beyond the eccentric 10 into abearing 11 formed in the overhanging arm. Said shaft has mounted thereona bevel gear 12 which is secured to the shaft by a suitable set screw13. A vertical shaft 14 is mounted in a bearing 15 The secured by thescrews 16, 16, to the overhanging arm. 'The upper end of the shaft 14:,carries a bevel gear 17 which meshes.

with the bevel gear 12. The lower end of the shaft 1 t carries a crankarm 18, on which is mounted a crank stud 19.

The loop spreader 20 is mounted in a bearing support 21, formed in a lugcarried by the o erhanging arm. The loop spreader is provided with acrank arm 22, at its upper end, which carries a stud 23 at its outerend. Said stud 23 is provided with spaced ears between which is pivoteda link 24. The opposite end of the link 2-1- has a universal connectionwith the crank pin 19.

The looper 25. is mounted in a bearing 26 secured to the head of themachine, and receives its oscillation from a crank arm 27,

secured to the upper end of the looper support. Said crank arm 27carries a stud at its outer end, which is provided with spaced ears andbetween said spaced cars is pivoted a link 28.

The crank pin 19 carries a laterally extending crank arm 29, at itslower end and at the outer end of said arm 29, is a second crank pin'30.One of these crank arms is timed ahead of the other. that-is, the crankpin carried thereby is ahead of the other crank pin in the revolution ofthe vertical shaft and with relation to the forming of the stitch sothat the looper is moved forward first and the spreader is then causedto oscillate to engage the looper thread. These crank arms are set indifferent horizontal planes so as to permit the crank pins to be freelyconnected to the parts which are operated thereby and the vertical shaftto make a complete rotation. The crank pin 30 is connected to the link28 by a universal ioint.

The operation of my device is as follows :The needle is reciprocatedback and forth across the work crimping ridge, and the thread carryinglooper is oscillated so as to engage the needle loop. 7 The loopspreader is then brought in contact with the looper thread, and carriesthe same across the line of seam into the path of the needle.

Having thus particularly described my invention, what I claim as new anddesire to secure by Letters Patent is 1. The combination of a worksupport, an overhanging arm, a main shaft in said overhanging arm, aneedle, a looper and a spreader cooperating with each other to formstitches, devices located in the forward end of the overhanging arm foroperating said needle, looper and Spreader from said main shaft, saiddevices including a vertical shaft having a driving connection with saidmain shaft and driving connections with the looper and spreader.

2. The combination of a work support, an overhanging arm, a needle, alooper and a spreader, devices located in the forward end of theoverhanging arm for operating said needle, said looper and saidspreader, said devices including a vertical shaft and nonalined crankpins carried by said vertical shaft for operating said looper and saidspreader.

3. The combination of a work support, an overhanging arm, a looper and aspreader, and means for operating said looper and spreader, including ashaft, a crank pin eccentrically mounted on the end of said shaft, anarm carri'edby said crank pin and a second crank pin carried by saidlast named arm, and means for connecting the spreader to one of saidcrank pins, and means for connecting the looper to the other of saidcrank pins.

4. The combination of a work support, an overhanging arm, a main shaftin said overhanging arm, a vertical shaft in said overhanging arm gearedto said main shaft, a looper, a spreader, a crank arm carried by saidvertical shaft for operating said spreader, an arm carried by said crankarm and a crank pin carried by said last named arm for operating saidlooper.

5. The combination of a work support, an overhanging arm, a main shaftin said overhanging arm, a vertical shaft in said overhanging arm gearedto said main shaft, a looper, a spreader, a crank arm carried by saidvertical shaft for operating said spreader, an arm carried by said crankarm,

memos and a crank pin carried by said last named arm for operating saidlooper, a needle lever pivoted to said overhanging arm, and devicesoperated from the forward end of the main shaft for operating saidneedle.

6. The combination of a work support, an overhanging arm, a main shaftin said overhanging arm, a vertical shaft in said overhanging arm gearedto said main shaft, a looper, a spreader, a crank arm carried by saidvertical shaft for operating said spreader, an arm carried by said crankarm, a crank pin carried by said last named arm for operating saidlooper, a needle lever pivoted to the overhanging arm, an eccentric onthe main shaft at the forward end thereof and a link connecting saideccentric and said needle lever.

7. The combination with a work support, an overhanging arm, a main shaftin said overhanging arm, a vertical shaft in said overhanging arm gearedto said main shaft, a looper, a spreader, a crank arm carried by saidvertical shaft for operating said spreader, a crank pin carried by saidcrank arm and a second crank arm carried by said crank pin for operatingsaid looper, one of said crank arms, being timed ahead of the other.

8. The combination of a work support, an overhanging arm, a main shaftin said overhanging arm, a vertical shaft in said overhanging arm gearedto said main shaft, a. looper, a spreader, a crank arm carried by saidvertical shaft for operating said spreader, a second crank arm foroperating said looper, said crank arms being in difierent horizontalplanes.

In testimony whereof I affix m y signature, in presence of twowitnesses.

- LANSING ONDERDONK.

Witnesses:

R. S. OSWALD, WALTER HARTLEY.

